Nice idea, but the test cases are a bit confusing. Why do you add one space before and after '(', but none after ')' and three between the letters and the '+' symbol?
Thanks for the input :)
The reason I add one before '(' is because there is a '2' before it, which is part of the term. The ones between the letters and the '+' symbol are because spaces are characters, too.
this "expand" reminds me a famous hilarious joke in classroom. but I guess this is the point...
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Find the maximum two numbers of every column of a matrix
Find nth maximum
Rotate array 90 degrees
Persistence will not help you solve this problem.
A little bit of luck needed
Persistence will help you solve almost any problem.
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